8255861565 has 32 divisors (see below), whose sum is σ = 15583420416. Its totient is φ = 3652361280.

The previous prime is 8255861561. The next prime is 8255861591. The reversal of 8255861565 is 5651685528.

It is not a de Polignac number, because 8255861565 - 2² = 8255861561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8255861561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1264927 + ... + 1271436.

It is an arithmetic number, because the mean of its divisors is an integer number (486981888).

Almost surely, 2^8255861565 is an apocalyptic number.

It is an amenable number.

8255861565 is a deficient number, since it is larger than the sum of its proper divisors (7327558851).

8255861565 is a wasteful number, since it uses less digits than its factorization.

8255861565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2536409.

The product of its digits is 2880000, while the sum is 51.

The square root of 8255861565 is about 90861.7717469784. The cubic root of 8255861565 is about 2021.0984422955.

The spelling of 8255861565 in words is "eight billion, two hundred fifty-five million, eight hundred sixty-one thousand, five hundred sixty-five".